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<title>[187759] branches/jsc-tailcall/Source/JavaScriptCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/187759">187759</a></dd>
<dt>Author</dt> <dd>msaboff@apple.com</dd>
<dt>Date</dt> <dd>2015-08-03 13:46:01 -0700 (Mon, 03 Aug 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>jsc-tailcall: Callee save registers should be saved after the stack pointer is set up
https://bugs.webkit.org/show_bug.cgi?id=147580
Reviewed by Basile Clement.
Moved the saving of callee saves to after we check for stack overflow and have
set up the stack pointer.
* dfg/DFGJITCompiler.cpp:
(JSC::DFG::JITCompiler::compile):
* jit/JIT.cpp:
(JSC::JIT::privateCompile):
* llint/LowLevelInterpreter.asm:</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchesjsctailcallSourceJavaScriptCoreChangeLog">branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchesjsctailcallSourceJavaScriptCoredfgDFGJITCompilercpp">branches/jsc-tailcall/Source/JavaScriptCore/dfg/DFGJITCompiler.cpp</a></li>
<li><a href="#branchesjsctailcallSourceJavaScriptCorejitJITcpp">branches/jsc-tailcall/Source/JavaScriptCore/jit/JIT.cpp</a></li>
<li><a href="#branchesjsctailcallSourceJavaScriptCorellintLowLevelInterpreterasm">branches/jsc-tailcall/Source/JavaScriptCore/llint/LowLevelInterpreter.asm</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchesjsctailcallSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog (187758 => 187759)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog 2015-08-03 20:40:38 UTC (rev 187758)
+++ branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog 2015-08-03 20:46:01 UTC (rev 187759)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2015-08-03 Michael Saboff <msaboff@apple.com>
+
+ jsc-tailcall: Callee save registers should be saved after the stack pointer is set up
+ https://bugs.webkit.org/show_bug.cgi?id=147580
+
+ Reviewed by Basile Clement.
+
+ Moved the saving of callee saves to after we check for stack overflow and have
+ set up the stack pointer.
+
+ * dfg/DFGJITCompiler.cpp:
+ (JSC::DFG::JITCompiler::compile):
+ * jit/JIT.cpp:
+ (JSC::JIT::privateCompile):
+ * llint/LowLevelInterpreter.asm:
+
</ins><span class="cx"> 2015-07-31 Michael Saboff <msaboff@apple.com>
</span><span class="cx">
</span><span class="cx"> jsc-tailcall: REGRESSION(r187676): Broke stress/tail-call-no-stack-overflow.js
</span></span></pre></div>
<a id="branchesjsctailcallSourceJavaScriptCoredfgDFGJITCompilercpp"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/dfg/DFGJITCompiler.cpp (187758 => 187759)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/dfg/DFGJITCompiler.cpp 2015-08-03 20:40:38 UTC (rev 187758)
+++ branches/jsc-tailcall/Source/JavaScriptCore/dfg/DFGJITCompiler.cpp 2015-08-03 20:46:01 UTC (rev 187759)
</span><span class="lines">@@ -290,7 +290,6 @@
</span><span class="cx">
</span><span class="cx"> setStartOfCode();
</span><span class="cx"> compileEntry();
</span><del>- compileSetupRegistersForEntry();
</del><span class="cx"> m_speculative = std::make_unique<SpeculativeJIT>(*this);
</span><span class="cx">
</span><span class="cx"> // Plant a check that sufficient space is available in the JSStack.
</span><span class="lines">@@ -299,6 +298,7 @@
</span><span class="cx">
</span><span class="cx"> addPtr(TrustedImm32(m_graph.stackPointerOffset() * sizeof(Register)), GPRInfo::callFrameRegister, stackPointerRegister);
</span><span class="cx"> checkStackPointerAlignment();
</span><ins>+ compileSetupRegistersForEntry();
</ins><span class="cx"> compileBody();
</span><span class="cx"> setEndOfMainPath();
</span><span class="cx">
</span></span></pre></div>
<a id="branchesjsctailcallSourceJavaScriptCorejitJITcpp"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/jit/JIT.cpp (187758 => 187759)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/jit/JIT.cpp 2015-08-03 20:40:38 UTC (rev 187758)
+++ branches/jsc-tailcall/Source/JavaScriptCore/jit/JIT.cpp 2015-08-03 20:46:01 UTC (rev 187759)
</span><span class="lines">@@ -526,9 +526,6 @@
</span><span class="cx">
</span><span class="cx"> Label beginLabel(this);
</span><span class="cx">
</span><del>- emitSaveCalleeSaves();
- emitMaterializeTagCheckRegisters();
-
</del><span class="cx"> sampleCodeBlock(m_codeBlock);
</span><span class="cx"> #if ENABLE(OPCODE_SAMPLING)
</span><span class="cx"> sampleInstruction(m_codeBlock->instructions().begin());
</span><span class="lines">@@ -560,6 +557,9 @@
</span><span class="cx"> move(regT1, stackPointerRegister);
</span><span class="cx"> checkStackPointerAlignment();
</span><span class="cx">
</span><ins>+ emitSaveCalleeSaves();
+ emitMaterializeTagCheckRegisters();
+
</ins><span class="cx"> privateCompileMainPass();
</span><span class="cx"> privateCompileLinkPass();
</span><span class="cx"> privateCompileSlowCases();
</span></span></pre></div>
<a id="branchesjsctailcallSourceJavaScriptCorellintLowLevelInterpreterasm"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/llint/LowLevelInterpreter.asm (187758 => 187759)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/llint/LowLevelInterpreter.asm 2015-08-03 20:40:38 UTC (rev 187758)
+++ branches/jsc-tailcall/Source/JavaScriptCore/llint/LowLevelInterpreter.asm 2015-08-03 20:46:01 UTC (rev 187759)
</span><span class="lines">@@ -845,13 +845,6 @@
</span><span class="cx">
</span><span class="cx"> codeBlockSetter(t1)
</span><span class="cx">
</span><del>- preserveCalleeSavesUsedByLLInt()
-
- if JSVALUE64
- move TagTypeNumber, tagTypeNumber
- addp TagBitTypeOther, tagTypeNumber, tagMask
- end
-
</del><span class="cx"> # Set up the PC.
</span><span class="cx"> if JSVALUE64
</span><span class="cx"> loadp CodeBlock::m_instructions[t1], PB
</span><span class="lines">@@ -882,6 +875,13 @@
</span><span class="cx">
</span><span class="cx"> .stackHeightOK:
</span><span class="cx"> move t0, sp
</span><ins>+
+ preserveCalleeSavesUsedByLLInt()
+
+ if JSVALUE64
+ move TagTypeNumber, tagTypeNumber
+ addp TagBitTypeOther, tagTypeNumber, tagMask
+ end
</ins><span class="cx"> end
</span><span class="cx">
</span><span class="cx"> # Expects that CodeBlock is in t1, which is what prologue() leaves behind.
</span></span></pre>
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